"It's the End of the World as We Know It (And I Feel Fine)" is a song by the rock band R.E.M., which appeared on their 1987 album Document, the 1988 compilation Eponymous, and the 2006 compilation And I Feel Fine... The Best of the I.R.S Years 1982–1987 It was released as a single in November 1987, reaching #69 US Billboard Hot 100 and later reaching #39 in the UK singles chart on its re-release in December 1991.

The song originated from a previously unreleased R.E.M. song called "PSA" ("Public Service Announcement"); the two songs are very similar in melody and tempo. "PSA" was itself later released as a single in 2003, under the title "Bad Day". In an interview with Guitar World magazine in the early 1990s, R.E.M. guitarist Peter Buck indicated that one of the primary inspirations of "End of the World" was Bob Dylan's "Subterranean Homesick Blues".

The music video was directed by James Herbert, who worked with the band on several other videos in the late 1980s. It depicts a young skateboarder, Noah Ray, rifling through an abandoned, collapsing farmhouse and displaying the relics that he finds to the camera.